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Old 11-18-2009, 10:57 AM   #1
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Angry trouble shooting hydraulic fan

I have a 1999 freightliner chassis under my 38 foot Dutch Star MH. The fan runs only when I unplug the solenoid on the what appears to be a hydraulic valve just inside the rear engine access door. Can anyone enlighten me as to the best way to trouble shoot the system. This is a side mounted radiator and fan by the way.

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Old 11-18-2009, 11:18 AM   #2
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Are you sure that you actually have a problem? My coach has a rear radiator so I don't have any first hand experience, but I do remember from my Camp Freightliner class that any electrical disconnect forces the fan into high speed mode.

What I don't know is if the fan runs at all until the engine gets warm.

Good luck.
2019 Phaeton 37BH
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Old 11-18-2009, 02:48 PM   #3
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On later the models the side rad fan does not run until it needs to. The fail safe mode is "ON", so that's why it runs when you disconnect.

Are you overheating in normal operation?
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
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Old 11-18-2009, 08:05 PM   #4
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The gauge on the dash has not gotten into the red but is very high in my opinion, perhaps I am gun shy and need to do more investigation.
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